diff --git a/composer.json b/composer.json
index 96a0500..5f58bf4 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "firebase/php-jwt": "^5.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.0",
+        "phpunit/phpunit": "^8.0|^9.0",
         "orchestra/testbench": "^6.0",
         "codedungeon/phpunit-result-printer": "^0.26.2"
     },